A manual of obstetrics . rrounding cu-taneous surface of the —Each gland iscomposed of lobes—from fif-teen to twenty-four in num-ber—united by a certainamount of connective andadipose tissue. Each lobeis subdivided into a largenumber of lobules, and theseare further divided into avast number of acini or vesi-cles, within which the milk is secreted. Each lobe has itsduct, known as a lactiferous or galactophoroiis duct, andthese all center at the nipple ; they each possess an ampullaor dilatation just before their termination in the nipple, andin these ampullai the milk is stored
A manual of obstetrics . rrounding cu-taneous surface of the —Each gland iscomposed of lobes—from fif-teen to twenty-four in num-ber—united by a certainamount of connective andadipose tissue. Each lobeis subdivided into a largenumber of lobules, and theseare further divided into avast number of acini or vesi-cles, within which the milk is secreted. Each lobe has itsduct, known as a lactiferous or galactophoroiis duct, andthese all center at the nipple ; they each possess an ampullaor dilatation just before their termination in the nipple, andin these ampullai the milk is stored. Milk.—This is the secretion of the mammary glands ; itconsists of an aqueous basis in which are contained largequantities of milk-globules and a variety of substances, suchas casein, albumin, fat, lactose or milk-sugar, and salts. Itis formed by an overgrowth and fatty infiltration of the epi-thelial cells lining the acini ; these degenerated cells finallyrupture and discharge their liquid contents: the aqueous. Fig .—Mammary glands : i, lacteal duels ;glandular acinus (after Playfair). 198 A MANUAL OF OBSTETRICS. portion of the milk is directly obtained from the blood by aprocess of exudation from the blood-vessels. Human milkis a yellowish-white or bluish fluid, somewhat translucent,of an alkaline reaction, and having a specific gravity offrom 1024 to 1034; when a digestive ferment, such as ren-net, is added to it, a light flocculent coagulum is the first eight or ten days, in addition to the ordinaryconstituents there is present in the milk a large numberof colostniin-corpnscles, which exert a beneficial effect uponthe infant. As received from the breast no bacteria are con-tained in the milk ; it is absolutely sterile. The secretion of milk is established generally at the ex-piration of forty-eight hours after labor; this may be accom-panied by manifestations of slight systemic disturbance, butthe so-called viilk-fcver is no longer recognized as a p
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectobstetrics, bookyear1
